mod a_panic;
mod b_option_unwrap;
mod b_quetion_mark;
mod b_map;
mod b_and_then;
mod c_result;
mod d_option_result;
mod d_define_error_type;
mod d_boxing_errors;
mod d_reenter_question_mark;
mod d_wrap_error;
mod e_iter_result;

fn main() {
    println!("Hello, world!");
}
